Paint pressure box with heat exchanger



March 7, 1950 E. A. A. AXELSON ETAL 2,499,447

PAINT PRESSURE BOX WITH HEAT EXCHANGER Filed May 5, 1945 i l" 2 loINVENTORS" E.A.A. AXELSON a CA. LOFGREN BY: W, fah v Ce.

AGENTS Patented Mar. 7, 1950 sesa e lisieriieierswet teex sers. ri; k wg-ren Stoekholrn, Sweden, assignorsjtoesvens lvfqskinaktiebolageicfireiff, Stockholm, Sweden, ricim flfi itfigmnfinyr I.

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It is known"in:sprayepistelseto heat the paint One channe1 system ID ofthe heat exch supplied t t ra iisto a nra aints-pre su :-is=.by -.mer1s-.ioi pipes .4 1? ene ate e box-attached to the pistol or---ir,containen hot=.,compressed;air;source lias wellas v a However, in thiscase the paint has been heated cQimpressed.,ai l .-iri ,1et -]iipflth pistol 4, an by means oi- -a heating coil or thic-like located moreoverby. i -channe1 l reducing aroundor within the container, and the pressue crs espectirel i. and passe ra a. air...

e Qhr@ dev ce.. s:.- nnectedrw h ii raw ck that: ttereach ll ctzshcrmt iiliewy si gin-Which involves much loss of time. Further, ch nnel (notshown) of the spray pistol. it is difficult to maintain the paint atthesame Having now described our invention, what we suitablalteinperaturebe fore theispraying temperature all the time because the temperaclaimas new and desire to secure by Letters ture of the paint will riseaccording as the quan- Patent is: tity of the paint decreases.Consequently, the 1. A paint pressure box for spray pistols compaintingbecomes different according to the temprising a paint container, aclosure therefor, a perature of the paint. heat exchanger located in theupper portion of According to the present invention this drawsaidcontainer and consisting of a metal block back is eliminated by thepaint pressure box or having two series of parallel channels therein,container being provided with a heat exchanger means for flowing hotcompressed air through. provided within or outside the same, one channel1 one of said channel series, a connection from the system of the saidheat exchanger being conlower portion of said paint container to theother nected to a source for heated compressed air, the v of saidchannel series, and means for flowing other channel system of the heatexchanger being hot compressed air into said paint container toconnectedto the spray pistol and to the paint force paint through said paintconnect on into receiving portion of the paint pressure box. said otherchanne1 series in heat exchange rela-- The invention is illustrated inthe accompanytion with the hot air flowing in said first mening drawingin which Figure 1 is a side view ioner channe1 series. partly in sectionof a. spray pistol and attached h combination, with a p y gun a a; paintpressure box and Figure 2 is a top plan paint pressure box. of a heatexchanger comprisview drawn to a smaller scale of the heat exin a firsch nne1 y em c mm ni n w h changer seen with the closure removed. a ou eOf t compressed gas a t e In the drawing the reference numeral Ii'ndigun, a second dispen g channel system comcates the paint pressurebox, 2 its cover whichmunicating with the lower part of the box and by aconnection piece 3 is screwed on to the spray. with the gun, means forintroducing compressed pistol 4. Into the cover thereis screwed a heatgas. to the interior of the pressure box. the two exchanger 5. In apreferred embodiment th 40 channel systems being of substantial lengthand heat exchanger consists of a heat exchange body in intimate heatexchange relationship, and 6,'preferably of a light material with goodheat means for transferring the hot compressed gas conductability. Inthe body 6 there is a numfrom said first channel system after the hotgas ber of longitudinal channels 1 which through repasses therethrough,to said gun for atomizing cesses 8, 9 at the ends are connected with.onethe heated paint.

another to form two separate channel systems 3. The combination claimedin claim 2 where- IO and H, preferably with two or more parallel in themeans for introducing compressed gas to branches. The recesses are madein such a way the box comprises a channel independent of the that theyhave a smaller flow areathan the rest first and second channel systemsand communiof the channel systems. The body 6; is screwed cating withthe first channel system and with the on to the cover-2 .of .the paintpressure box I top of the box. 4 so that said cover completes thechannelsf'ormed 4. A paint p essure box for sp y ns h ying by therecesses 8. To the underside of the body a heat exchanger associatedtherewith, said heat 6 there is screwed a cover plate 12 completingexchanger comprising afirst channe1 system corr-v the channels formed bythe recesses 9. nected between a source for hot compressed gas and aspray gun and which also communicates with the interior of the pressurebox, a second dispensing channel system in heat exchange relationshipwith the first channel system and connected between the lower portion ofthe pressure box and the spray gun, the cross-sections of the channelsystems and of the interior of the box being so proportioned that themajor part of the gas flows through the first channel system and only aminor part enters the box, and means for transferring the hot compressedgas from said first channel system after the hot gas passestherethrough, to said gun for atomizing the heated paint.

5. A paint pressure box as claimed in claim 4, wherein the heatexchanger comprises a, body having parallel channels runningtherethrough and recesses at the ends of the body connecting thechannels in groups to form two separate channel systems each with two ormore parallel branches.

6. In combination with a paint pressure box for spray guns, a heatexchanger comprising a first channel system communicating with a sourceof hot compressed gas and with the spray gun, a second dispensingchannel system communica ing with the lower part of the box and with thespray gun, the two channel systems being of substantial length and inintimate heat exchange relationship, means for introducing compressedgas to the interior of the pressure box, and means for transferring thehot compressed gas from said first channel system after the hot gaspasses therethrough, to said heated paint.

7. The combination claimed in claim 6 Wherein the means for introducingcompressed gas to the box comprises a channel independent of the firstand second channel systems and communicating with the first channelsystem and with the top of the box.

8. The combination as claimed in claim 2 wherein the heat exchangercomprises a heat exchange body having parallel channels therein throughwhich recesses at the ends are connected with one another to form twochannel systems with two or more parallel branches.

9. The -'combination as claimed in claim 8 wherein the recesses have asmaller flow area gun for atomlzing the than the rest of the channelsystems.

ESKIL ANDERS AUGUST AXELSON. CARL AKE LoFGREN.

REFERENCES one!) The following references file of this patent:

UNITED STATES PATENTS are of record in the Number Name Date 1,052,002Kent Feb. 4, 1913 1,587,736 Schenck June 8, 1926 1,644,081 Prebel Oct.4, 1927 1,737,347 Wilson Nov. 26, 1929 1,998,776 Collins Apr. 23, 19352,114,661 West Apr. 19, 1938' 2,148,986 Hoyt Feb. 28, 1939

